23. g5f6  23... b7b3 This doesn't spoil anything, but 23...g6 is safer. 24. g1g7  24... g8h8 [%c_effect h8;square;h8;type;Mistake;persistent;true] The wrong square. Now White is winning, thanks to an incredible tactical idea. 25. g7h7 [%c_effect h7;square;h7;type;GreatFind;persistent;true]